# RhythmReactor vs Foldmetry

The clearest difference is in-app purchases: RhythmReactor at none against Foldmetry's 2. RhythmReactor also leads on iOS requirement (9.3 vs 17.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Foldmetry sells 2 in-app purchases, starting at $9.99 per year. RhythmReactor asks for nothing beyond the download.

RhythmReactor ships an update every 2 weeks, Foldmetry every 9 days. The most recent releases landed on October 5, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | RhythmReactor | Foldmetry |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/foldmetry-spatial-reasoning/id6792459865/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 9 days** |
| Monetization | — | Freemium |
| Size | 36 MB | 16 MB |
| Requires iOS | **9.3** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Brian Wis](https://appshunter.io/developer/931267858) | [思迪 李](https://appshunter.io/developer/1448600251) |

## What reviewers say

### RhythmReactor

[App page](https://appshunter.io/ios/app/rhythmreactor/id1452060080)

**Features:** macOS Compatibility

**In-app purchases:** none


### Foldmetry

[App page](https://appshunter.io/ios/app/foldmetry-spatial-reasoning/id6792459865)

Practice spatial reasoning skills for 11+ and CAT4-style assessments. Offers interactive exercises in mental rotation, cube nets, perspective taking, paper folding, block assembly, and cross sections.  Unlock full features with a subscription or lifetime purchase.

**Highlights:** Mental Rotation exercises, Cube Nets prediction, Perspective Taking visualization, Paper Folding reversal, Block Assembly counting, Cross Sections slicing, Timed exam-style practice

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Foldmetry Pro Annual | $9.99 | per year |
| Foldmetry Pro Lifetime | $24.99 | one-time |


## Frequently asked questions

### Is RhythmReactor free?

RhythmReactor is free to download, with no in-app purchases.

### Is Foldmetry free?

Foldmetry is free to download, with in-app purchases available.

### Do RhythmReactor or Foldmetry have ads?

Neither RhythmReactor nor Foldmetry shows ads.

### Which is updated more often, RhythmReactor or Foldmetry?

RhythmReactor ships an update every 2 weeks, and Foldmetry every 9 days. Most recently, RhythmReactor was updated on October 5, 2026 and Foldmetry on October 1, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*